Property Dispositions and Assets Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales Proceeds	$ 1,946	$ 297,388	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	1,900
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Two Pierce Place
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	1,741
Net Sales Proceeds	24,272
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 225 and 235 Presidential Way
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	49,218
Net Sales Proceeds	119,609
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Cambridge Portfolio
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale of Real Estate Assets	102,570
Net Sales Proceeds	$ 155,307